【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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正垂线
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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侧垂线
③
Normal
0
7.8 磅
0
2
false
false
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EN-US
ZH-CN
X-NONE
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mso-para-margin-bottom:.0001pt;
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正平线
④
Normal
0
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0
2
false
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ZH-CN
X-NONE
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铅垂线
【单选题】
下颌下三角位于（）
①
二腹肌前、后腹与下颌体下缘之间
②
二腹肌前腹与舌骨体之间
③
二腹肌前、后腹与甲状软骨上缘之间
④
二腹肌后腹与舌骨体之间
⑤
上颌骨与二腹肌前、后腹之间